当量比天然气发动机燃烧和排放的优化研究  

Optimization study of combustion and emission of stoichiometric natural gas engine

作　　者：曹文霞[1] 胡必谦 孙泽 胡帅 位晓飞 钱叶剑 CAO Wenxia;HU Biqian;SUN Ze;HU Shuai;WEI Xiaofei;QIAN Yejian(Anhui Technical College of Water Resources and Hydroelectric Power,Hefei 231603,China;Anhui Jianghuai Group Automobile Corp,Ltd.,Hefei 230601,China;Hefei University of Technology,Hefei 230009,China)

机构地区：[1]安徽水利水电职业技术学院,安徽合肥231603 [2]安徽江淮汽车集团股份有限公司,安徽合肥230601 [3]合肥工业大学,安徽合肥230009

出　　处：《安徽水利水电职业技术学院学报》2023年第4期25-30,共6页Journal of Anhui Technical College of Water Resources and Hydroelectric Power

基　　金：国家自然科学基金项目(51676062);安徽省高等学校科学研究项目(2022AH052305)。

摘　　要：为改善天然气发动机燃烧,降低NO_(x)排放,采用数值模拟方法研究了缩口燃烧室与喷水温度对天然气发动机燃烧和排放的影响。研究发现:缩口结构促使缸内混合气形成良好的贴壁流动,有利于燃料和空气混合。这些因素提高了火焰传播速度,增加了NO_(x)排放。相比原机,方案一的缩口角度增大26°,燃烧持续期缩短,NO_(x)排放增加32.3%。进气道的蒸发量随着喷水温度升高而增多,这导致更多的水进入缸内。采用缩口燃烧室并提高喷水温度有利于加快缸内燃烧速率,降低燃烧温度和NO_(x)排放。To improve the combustion and reduce NO_(x) emission of natural gas engine,the effect of combustion chamber with throat angle and water injection temperature on the combustion and emission of natural gas engine were investigated by numerical simulation.The results show that the throat angle of combustion chamber promoted the formation of a good wall-fitting flow of the in-cylinder mixture,which was beneficial to the fuel and air mixing.These factors accelerated the flame speed and increased the NO_(x) emission.The throat angle of Option 1 was increased by 26° compared with the original machine,which resulted in the reduced combustion duration and a 32.3% increase in NO_(x) emissions.Furthermore,the amount of water evaporating in the intake port raised with the increase of water temperature,which caused that more water entered cylinder.Adopting the combustion chamber with throat angle and increasing the water injection temperature was beneficial to accelerate the flame speed and reduce the combustion temperature and NO_(x) emission.

关 键 词：天然气发动机 燃烧室结构 喷水温度 湍动能 NO_(x)排放 

分 类 号：TK436[动力工程及工程热物理—动力机械及工程]